10 OMG Moments From Last Night’s ‘Pretty Little Liars’

Last night's episode of Pretty Little Liars was super intense. Not only did the girls finally find out where the mysterious number that they've been trying to reach was coming from, but Hanna gets arrested and 'A' targets Aria's mom.

Click through to see 10 OMG moments from "Gamma Zeta Die!" Then head over to Twist to get a style recap of the episode!

Aria confronts her brother because she's mad that he doesn't want their mom going to Europe. He yells at Aria saying, "It’s hard to get frisky with Fitz when someone’s looking over your shoulder, huh?"

Spencer approaches a student while touring Cicero College to ask about the mysterious number. He tells her that first three numbers mean it’s coming from a location on campus and the next three mean it’s on Greek Row.